Spirea plant need regular watering during their first growing season, followed by occasional watering during dry spells. Apply a layer of mulch around the base to retain soil moisture and control weeds, keeping the mulch away from the main stem. Pruning helps maintain the plant's shape and encourages healthy growth. Spring-flowering varieties should generally be pruned after flowering, while summer-flowering types can be pruned in late winter or early spring. Remove dead or damaged branches as needed, and avoid excessive fertilizer, which can encourage leafy growth at the expense of flowers.